On 14 May 2019, at 22:06, Nicolas Ecarnot <nicolas@ecarnot.net> wrote:
Hi Nir, hi Sandvik,
As I saw this issue lots of times and as I'm using thin prov. + block storage, I feel concerned. Read my question below.
Le 02/10/2016 à 12:55, Nir Soffer a écrit :
On Sun, Oct 2, 2016 at 12:06 PM, Sandvik Agustin <agustinsandvik@gmail.com> wrote:
Hi users,
I have this problem that sometimes 1 to 3 VM just automatically paused with user interaction and getting this error "VM has paused due to no storage space error". any inputs from you guys are very appreciated. This is expected - when there is no storage space :-)
The vm is paused when there are some io pending io requests that could not be fulfilled since you don't have enough space.
In a real machine the io requests would fail. In a vm, the vm can pause, you can fix the issue (extend the storage domain), and resume the vm.
But I guess there is storage space available, otherwise you would not spend the time sending this mail.
This can happen when using thin provisioned disks on block storage (iSCSI, FC). We provision such disk with 1G, and and extend the disk (add 1G) when it becomes too full (by default, free space < 0.5G).
If we fail to extend the disk quick enough,
"quick enough" -> Is there some place where this threshold can be configured?
vdsm.conf ('volume_utilization_percent', '50', 'Together with volume_utilization_chunk_mb, set the minimal free ' 'space before a thin provisioned block volume is extended. Use ' 'lower values to extend earlier.'), ('volume_utilization_chunk_mb', '1024', 'Size of extension chunk in megabytes, and together with ' 'volume_utilization_percent, set the free space limit. Use higher ' 'values to extend in bigger chunks.’), HTH, michal
the vm will pause before the extend was completed. Once the extend was completed, we resume the vm.
So you may see very short pauses, but they should be rare.
To understand the issue, we need to inspect vdsm logs from the host running the vm that paused, showing the timeframe when the vm was paused.
You should see this message in the log each time a vm pauses:
abnormal vm stop device <devname> error ENOSPC
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